WValidatorFactory.java

package com.delcyon.capo.webapp.widgets;

import eu.webtoolkit.jwt.WValidator;

/** this is just a wrapper class around WValidator that less us use java 8 lambdas 
 * 
 * @author jeremiah
 *
 */
public abstract class WValidatorFactory extends WValidator
{
	@Override
	public Result validate(String input)
	{
		return validateFunction(input);
	}

	/**
	 * method overridden by lambda expression
	 * @param input
	 * @return
	 */
	protected abstract Result validateFunction(String input);
	
	/**
	 * factory method to to use a lambda to make a custom WValidator
	 * {@link WValidatorInterface#validateFunction(String) validate} method.
	 * @param (String input) -> Result 
	 * @return WValidator
	 */
	public static WValidator validator(WValidatorInterface validatorInterface)
	{
		return new WValidatorFactory()
		{
			@Override
			public Result validateFunction(String input)
			{
				return validatorInterface.validateFunction(input);
			}
		};
	}
	
	/**
	 * matches the validate method from WValidator
	 *
	 */
	public interface WValidatorInterface
	{		
		public abstract Result validateFunction(String input);

	}
}